date retrieving problem help

using (SqlConnection conn = new SqlConnection(conStr))
                {   // Creating insert statement
                    string sql = string.Format(@"SELECT * FROM clientInfo where cl_id = " + txtUID.Text);
                    SqlCommand cmd = new SqlCommand();
                    cmd.Connection = conn;
                    cmd.CommandText = sql;
                    SqlDataReader dr = null;
                    cmd.CommandType = CommandType.Text;
                    conn.Open();
                    dr = cmd.ExecuteReader();
                    if (dr.Read())
                    {
                        txtFName.Text = (dr["cl_name"].ToString());
                        txtUNic.Text = (dr["cl_cnic"].ToString());

                        txtUDob.Text = (dr["cl_dob"].ToString());
txtECMNumber.Text = (dr["cl_rcphone"].ToString());


                    }
                    conn.Close();
}

txtUDob.Text = (dr["cl_dob"].ToString());